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The most important use of multiple IP addresses per physical machine today (in my view) is the ability to create virtual machines on the host with its own IP addresses, but there might be other benefits as well, like if you can't use SNI for HTTPS and still want to use more than one vhost on the machine.

So are you saying with only 1 IP address, I couldn't host more than 1 website? I'm certain I can define several vhost configs, and have the DNS point all domains at the 1 IP, then the vhost configs would handle which directory/website is served up based on the domain the incoming request is coming from?
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i-CONICAMar 28 '14 at 11:33

Yes, but that's not working with HTTPS without SNI.
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Sven♦Mar 28 '14 at 11:40

@SvW To be more precise you can't have multiple https sites using different certificates on a single IP without requiring SNI (Server Name Indication). Multiple sites with a single wildcard cert or a SAN (Subject Alternative Name) cert which matches all of the site names would also work on a single IP.
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Håkan LindqvistMar 30 '14 at 19:37